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Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

This is the largest contentful element painted within the viewport. Learn more about the Largest Contentful Paint element

Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. Learn how to eliminate render-blocking resources.

Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. Learn more about text compression.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Search engines are unable to include your pages in search results if they don't have permission to crawl them. Learn more about crawler directives.

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Pages with unsuccessful HTTP status codes may not be indexed properly. Learn more about HTTP status codes.

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

All sites should be protected with HTTPS, even ones that don't handle sensitive data. This includes avoiding mixed content, where some resources are loaded over HTTP despite the initial request being served over HTTPS. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs. Learn more about HTTPS.

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.